EP3599661A1

EP3599661A1 - Antenna and mobile terminal

Info

Publication number: EP3599661A1
Application number: EP19188095.4A
Authority: EP
Inventors: Jiarong LIU
Original assignee: Beijing Xiaomi Mobile Software Co Ltd
Current assignee: Beijing Xiaomi Mobile Software Co Ltd
Priority date: 2018-07-27
Filing date: 2019-07-24
Publication date: 2020-01-29
Anticipated expiration: 2039-07-24
Also published as: US20200036082A1; CN108987908B; WO2020019465A1; KR20200012822A; JP6860690B2; US10819012B2; JP2020530948A; EP3599661B1; CN108987908A; KR102135144B1

Abstract

The present disclosure relates to an antenna and a mobile terminal. The antenna is applied to the mobile terminal, and the mobile terminal includes a first metal frame and a second metal frame, a length of the first metal frame being within a range of a quarter wavelength of a specified band. The first metal frame includes a feeding point which is located at a specified position of a first end of the first metal frame, herein the feeding point is coupled to a first end of a first capacitive device, a second end of the first capacitive device is coupled to a first end of a changeover switch, a second end of the changeover switch is coupled to a first end of a second capacitive device or a first end of an inductive device, a second end of the second capacitive device or a second end of the inductive device is coupled to a first ground point, and a second end of the first metal frame is coupled to a second ground point, so as to form a first sub-antenna; and a second end of the second metal frame is coupled to a third ground point, so as to form a second sub-antenna. Thus, radiation from an antenna to various different band signals is implemented without the addition of other devices or antenna branches.

Description

TECHNICAL FIELD

The embodiments of the present disclosure relate to the technical field of mobile terminals, and in particular to an antenna and a mobile terminal.

BACKGROUND

With the arrival of a 5G era, more and more bands are available for signal transmission, so that demands for antenna radiation in a mobile terminal are also increasing. For example, the antenna is required to be able to radiate signals in a low frequency millimeter wave band in 5G in addition to an existing band. The low frequency millimeter wave band is commonly known as a Sub-6GHz band. However, with the rapid development of the mobile terminal technology, a screen-to-body ratio of the mobile terminal is increasing, and a number of devices having a metal structure internally is also increasing, thereby causing the decrease of a clearance area for designing the antenna inside the body of the mobile terminal. Therefore, at present, it is urgently necessary to design an antenna in a smaller clearance area to implement radiation of various band signals.

SUMMARY

Accordingly, the embodiments of the present disclosure provide an antenna and a mobile terminal, which can implement radiation of various band signals.
According to a first aspect of the embodiments of the present disclosure, there is provided an antenna, applied to a mobile terminal, the mobile terminal includes a first metal frame and a second metal frame, a breaking joint is provided between a first end of the first metal frame and a first end of the second metal frame, the length of the first metal frame is within the range of a quarter wavelength of a specified band, and the length of the first metal frame is greater than the length of the second metal frame,
herein the first metal frame includes a feeding point which is located at a specified position of the first end of the first metal frame, the feeding point is coupled to a first end of a first capacitive device, a second end of the first capacitive device is coupled to a first end of a changeover switch, a second end of the changeover switch is coupled to a first end of a second capacitive device or a first end of an inductive device, a second end of the second capacitive device or a second end of the inductive device is coupled to a first ground point, and a second end of the first metal frame is coupled to a second ground point, so as to form a first sub-antenna; and
a second end of the second metal frame is coupled to a third ground point, so as to form a second sub-antenna.
In the aforementioned technical solution, the antenna is mainly implemented by a first metal frame and a second metal frame of the mobile terminal, a breaking joint being provided between the first metal frame and the second metal frame. A specified position of an end, close to the breaking joint, of the first metal frame includes a feeding point, the feeding point is coupled to a first capacitive device, the first capacitive device is coupled to a changeover switch, the changeover switch is coupled to a second capacitive device or an inductive device, the second capacitive device or the inductive device is coupled to a first ground point, and the first metal frame is coupled to a second ground point, so as to form a portion of the antenna. In addition, the second metal frame is coupled to a third ground point, so as to form another portion of the antenna. Since the length of the first metal frame is within the range of a quarter wavelength of a specified band, when the changeover switch is switched between the second capacitive device and the inductive device, the two portions of the antenna not only may implement radiation of the existing band signal, but also may implement radiation of a signal of a low frequency millimeter wave band by using a harmonic wave under a high-order mode of the first metal frame, that is, may also radiate a signal of a Sub 6GHz band. In the embodiments of the present disclosure, the antenna implements radiation of various different band signals without the addition of other devices and antenna branches.
According to an exemplary embodiment, the changeover switch is located at a center point of the first metal frame.
According to an exemplary embodiment, when the changeover switch is switched to be coupled to the second capacitive device, the first sub-antenna and the second sub-antenna are configured to radiate a low-and-medium frequency signal and a signal of a low frequency millimeter wave band; and
When the changeover switch is switched to be coupled to the inductive device, the first sub-antenna and the second sub-antenna are configured to radiate a high frequency signal and the signal of the low frequency millimeter wave band.
According to an exemplary embodiment, when the changeover switch is switched to be coupled to the second capacitive device, a portion between a position where the second capacitive device is located in the first sub-antenna and the breaking joint and the second sub-antenna are jointly configured to radiate a medium frequency signal, a resonance under a quarter wavelength mode of the first sub-antenna is configured to radiate a low frequency signal, and a resonance under a three-quarter wavelength mode of the first sub-antenna is configured to radiate the signal of the low frequency millimeter wave band; and
When the changeover switch is switched to be coupled to the inductive device, a portion between a position where the inductive device is located in the first sub-antenna and the breaking joint and the second sub-antenna are jointly configured to radiate a high frequency signal, a resonance under a three-quarter wavelength mode of the first sub-antenna is configured to radiate the signal of the low frequency millimeter wave band.
According to an exemplary embodiment, a difference between the length of the first metal frame and 30 mm is within a preset range, and the length of the second metal frame ranges from 16 mm to 20 mm.
According to an exemplary embodiment, the first capacitive device has a capacitance ranging from 0.5 pf to 2.5 pf.
According to an exemplary embodiment, both the first metal frame and the second metal frame are a bottom frame of the mobile terminal.
According to an exemplary embodiment, the breaking joint between the first end of the first metal frame and the first end of the second metal frame has a width of 2 mm.
According to an exemplary embodiment, the second end of the first capacitive device is coupled to the first end of the changeover switch through the first metal frame.
According to a second aspect of the embodiments of the present disclosure, there is provided a mobile terminal. The mobile terminal includes the antenna described above in the first aspect.
The advantages and technical effects of the mobile terminals according to the invention correspond to those of the antennas presented above.
It will be appreciated that the above general description and the following detail description are only exemplary and explanatory, and cannot limit the present disclosure.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings herein are incorporated into the specification and constitute a portion of the present specification, illustrate the embodiments conforming to the present disclosure, and are used to explain the principle of the present disclosure with the specification.

FIG. 1 is a structural schematic diagram of an antenna according to an exemplary embodiment.
FIG. 2 is a schematic diagram of a front solid structure of an antenna according to an exemplary embodiment.
FIG. 3 is a schematic diagram of a back solid structure of an antenna according to an exemplary embodiment.
FIG. 4 is a schematic Smith diagram according to an exemplary embodiment.
FIG. 5 is an equivalent circuit diagram according to an exemplary embodiment.
FIG. 6 is a schematic diagram of a signal return loss according to an exemplary embodiment.
FIG. 7 is an equivalent circuit diagram according to an exemplary embodiment.
FIG. 8 is a schematic diagram of a signal return loss according to an exemplary embodiment.

Drawing reference labels:

1: First metal frame; 2: second metal frame; 3: feeding point; 4: first capacitive device; 5: changeover switch; 6: second capacitive device; 7: inductive device.

DETAILED DESCRIPTION

Exemplary embodiments will be described in detail here, examples thereof being expressed in the drawings. When the following description involves the drawings, identical digits in different drawings represent identical or similar elements unless otherwise indicated. Implementation manners described in the following exemplary embodiments do not represent all implementation manners consistent with the present disclosure. On the contrary, they are only examples of a device and a method consistent with some aspects of the present disclosure.
Before an antenna structure and a signal radiation principle provided by the embodiments of the present disclosure are described in detail, an application scenario involved in the embodiments of the present disclosure will be briefly introduced first.
At present, similar to a Time Division Long Term Evolution (TDD-LTE) and a Frequency Division Duplex Long Term Evolution (FDD-LTE) of a 4G era, a 5G technology at the present stage also has two development directions namely millimeter wave bands of Sub-6GHz and 6GHz or above. In the two directions, the implementation of Sub-6GHz is relatively easy and can follow the existing infrastructure of an operator, and the division of bands is also relatively clear. Therefore, over the next few years, the Sub-6GHz band will become an important transitory technology of a 5G upgrade plan of the operator. The Sub-6GHz band may include bands n77, n78 and n79, such as 3.3 GHz to 3.6 GHz in the band n77 domestically issued to be used, and 4.8 GHz to 5 GHz in the used band n79. This requires the demands for radiating the antenna in the mobile terminal to increase. That is, the antenna is required to not only radiate a signal of the existing band, but also radiate a signal of the above Sub-6GHz band, the existing band including, for example, 2G, 3G or 4G. However, with the popularization and evolution of full screen and metal materials, a clearance area reserved in the mobile terminal for the antenna is more and more compact. Thus, it will be very difficult to radiate a signal of a Sub-6GHz band on the basis of radiating the existing band signal.
To this end, the embodiments of the present disclosure provide an antenna. The antenna may implement radiation of signals of the existing band and a Sub-6GHz band without the addition of a device such as a switch and antenna branches, so as to solve a contradiction between the increasingly difficult antenna design and the increase of band demands.
The following will introduce the antenna provided by the embodiments of the present disclosure in detail with reference to the drawings. Referring to FIG. 1, FIG. 1 is a structural schematic diagram of an antenna according to an exemplary embodiment. The antenna is applied to a mobile terminal. The mobile terminal mainly includes a first metal frame 1 and a second metal frame 2. A breaking joint is provided between a first end of the first metal frame 1 and a first end of the second metal frame 2. The length of the first metal frame 1 is within the range of a quarter wavelength of a specified band, and the length of the first metal frame 1 is greater than the length of the second metal frame 2.
The first metal frame 1 includes a feeding point 3, the feeding point 3 being located at a specified position of the first end of the first metal frame 1. The feeding point 3 is coupled to a first end of a first capacitive device 4, a second end of the first capacitive device 4 is coupled to a first end of a changeover switch 5, a second end of the changeover switch 5 is coupled to a first end of a second capacitive device 6 or a first end of an inductive device 7, a second end of the second capacitive device 6 or a second end of the inductive device 7 is coupled to a first ground point, and a second end of the first metal frame 1 is coupled to a second ground point, so as to form a first sub-antenna. A second end of the second metal frame is coupled to a third ground point, so as to form a second sub-antenna.
Referring to FIG. 2 and FIG. 3, FIG. 2 and FIG. 3 are schematic diagrams of a front solid structure and a back solid structure of the antenna on the mobile terminal, respectively. That is to say, the antenna is designed here by using the existing first metal frame 1 and second metal frame 2 of the mobile terminal. Thus, space occupied by the antenna may be saved without the addition of other devices or antenna branches. That is, an antenna may be designed in a smaller clearance area by using the first metal frame 1 and the second metal frame 2, and radiation of various band signals is implemented by using the antenna.
In some embodiments, both the first metal frame 1 and the second metal frame 2 may be a bottom frame of the mobile terminal. Of course, in some other embodiments, both the first metal frame 1 and the second metal frame 2 may also be a top frame of the mobile terminal, or, either the first metal frame 1 or the second metal frame 2 may be the top frame of the mobile terminal while the other one is the bottom frame of the mobile terminal, which is not limited in the embodiments of the present disclosure.
The above specified position may be customized by a user according to actual demands, that is, in the embodiments of the present disclosure, a feeding point 3 is disposed at a tail end, close to the breaking joint, of the first metal frame 1, and the feeding point 3 is coupled to the first end of the first capacitive device 4. In addition, in order to implement radiation of different band signals, the second end of the first capacitive device 4 is coupled to the first end of the changeover switch 5, and the second end of the changeover switch 5 is coupled to the first end of the second capacitive device 6 or the first end of the inductive device 7, so that when the changeover switch 5 is switched between the second capacitive device 6 and the inductive device 7, the radiation of different band signals may be implemented.
Further, since there is an electric field zero point in a radiating magnetic field of the first metal frame 1, the changeover switch 5 may be usually loaded to a position of a non-electric field zero point of the first metal frame 1 under a low-order mode and a high-order mode so as not to affect the operation of the changeover switch 5. For example, in some embodiments, the changeover switch 5 may be located at a center point of the first metal frame 1.
In a possible implementation manner, the second end of the first capacitive device 4 is coupled to the first end of the changeover switch 5 through the first metal frame 1.
For example, the second end of the first capacitive device 4 is coupled to the first metal frame 1, and the first end of the changeover switch 5 is coupled to the first metal frame 1. Since the first metal frame 1 has conductivity, the second end of the first capacitive device 4 is coupled to the first end of the changeover switch 5 through the first metal frame 1.
In some embodiments, the second end of the first capacitive device 4 is coupled to the first metal frame 1 through an elastic piece, and the first end of the changeover switch 5 is coupled to the first metal frame 1 through an elastic piece.
Further, the second end of the first capacitive device 4 may be coupled to the first metal frame 1 through one or more elastic pieces, and the first end of the changeover switch 5 may also be coupled to the first metal frame 1 through one or more elastic pieces.
In some embodiments, an example that the antenna can radiate a band n77 in Sub-6GHz is taken. In this case, the above specified band may range from 1.1 GHz to 1.2 GHz. In this way, the length of the first metal frame 1 meets a quarter wavelength mode around the frequency range of 1.1 to 1.2 GHz, wherein the wavelength is the above specified band wavelength.
In a possible implementation manner, a difference between the length of the first metal frame 1 and 30 mm is within a preset range, and the length of the second metal frame 2 ranges from 16 mm to 20 mm. That is, the length of the second metal frame 2 is usually required to meet a low-order mode resonance length of a high frequency portion from 2.3 GHz to 2.7 GHz.
The above preset range may be customized by the user according to actual demands, that is, the length of the first metal frame 1 may be set as about 30 mm.
Further, the first capacitive device 4 has a capacitance ranging from 0.5 pf to 2.5 pf. In an optional implementation manner, in order to improve the radiation accuracy of the antenna, the first capacitive device 4 may be selected as an adjustable capacitor, so as to set the magnitude of a required capacitance value by adjusting the capacitance value of the adjustable capacitor during the implementation. For example, compared with a scenario where the changeover switch is switched to be coupled to the second capacitive device 6, when the changeover switch 5 is switched to be coupled to the inductive device 7, the capacitance value of the first capacitive device 4 may be adjusted to be slightly larger.
In the embodiments of the present disclosure, the position of the feeding point 3 is adjusted to be close to the tail end of the first metal frame 1. The length of the first metal frame 1 meets a quarter wavelength mode around a frequency range of 1.1 GHz to 1.2 GHz. In this case, as shown in FIG. 4, according to a smith diagram in FIG. 4, it is apparent that point mark1 corresponding to the frequency range of 1.1 GHz to 1.2 GHz falls on a smith zero axis, and a corresponding frequency point of 0.9 GHz falls around a 50 Ohm constant impedance circle in an inductive area, as shown in the position of point mark2 in the smith diagram. In this case, through a triple relation calculation, it is apparent that a resonance frequency under a three-quarter wavelength mode of the first metal frame 1 approximately falls around the range of 3.3 GHz to 3.6 GHz, such as a range of mark3 to mark4 in the smith diagram. This segment also falls on and intersects with the 50 Ohm constant impedance circle. Therefore, when a first capacitive device with a smaller capacitance value is connected to the feeding point 3 in series, low frequency portions of 2G, 3G and 4G bands and a portion of Sub-6GHz can be simultaneously drawn to be around 50 Ohm along the direction of an arrow, and two resonant modes are activated simultaneously. Thus, the radiation of various band signals may be implemented by using resonances under different wavelength modes corresponding to the first metal frame 1.
Further, since the width of the breaking joint may cause a certain influence on the antenna, in some embodiments, the width of the breaking joint between the first end of the first metal frame 1 and the second end of the second metal frame 2 may be set as 2 mm, so as to implement a good signal radiation.
It is to be noted that the first ground point, the second ground point and the third ground point may be equal to each other or may also be different from each other, which is not limited in the embodiments of the present disclosure.
The principle of radiating, by the antenna, various band signals will be introduced thereafter. As described above, when the changeover switch 5 is switched between the second capacitive device 6 and the inductive device 7, the radiation of different band signals may be implemented specifically as follows:
When the changeover switch 5 is switched to be coupled to the second capacitive device 6, the first sub-antenna and the second sub-antenna are configured to radiate a low-and-medium frequency signal and a signal of a low frequency millimeter wave band. When the changeover switch 5 is switched to be coupled to the inductive device 7, the first sub-antenna and the second sub-antenna are configured to radiate a high frequency signal and the signal of the low frequency millimeter wave band.
Further, when the changeover switch 5 is switched to be coupled to the second capacitive device 6, a portion between a position where the second capacitive device 6 is located in the first sub-antenna and the breaking joint and the second sub-antenna are jointly configured to radiate a medium frequency signal, a resonance under a quarter wavelength mode of the first sub-antenna is configured to radiate a low frequency signal, and a resonance under a three-quarter wavelength mode of the first sub-antenna is configured to radiate the signal of the low frequency millimeter wave band. Alternatively, when the changeover switch 5 is switched to be coupled to the inductive device 7, a portion between a position where the inductive device 7 is located in the first sub-antenna and the breaking joint and the second sub-antenna are jointly configured to radiate a high frequency signal, a resonance under a three-quarter wavelength mode of the first sub-antenna is configured to radiate the signal of the low frequency millimeter wave band.
When the changeover switch 5 is switched to be coupled to the second capacitive device 6, referring to FIG. 5, FIG. 5 is an equivalent circuit diagram according to an exemplary embodiment. In this case, a resonance under a quarter wavelength mode of the first sub-antenna is configured to radiate a low frequency signal, and a resonance under a three-quarter wavelength mode of the first sub-antenna is configured to radiate a signal of a Sub-6GHz band. Referring to FIG. 6, FIG. 6 is a schematic diagram of a return loss of a radiated signal. From FIG. 6, it can be seen that the first sub-antenna and the second sub-antenna in this case implement radiation of a low-and-medium frequency signal and a signal of a Sub-6GHz band.
When the changeover switch 5 is switched to be coupled to the inductive device 7, referring to FIG. 7, FIG. 7 is an equivalent circuit diagram according to an exemplary embodiment. In this case, a resonance under a three-quarter wavelength mode of the first sub-antenna is configured to radiate a signal of a Sub-6GHz band. Referring to FIG. 8, FIG. 8 is a schematic diagram of a return loss of a radiated signal. From FIG. 8, it can be seen that the first sub-antenna and the second sub-antenna in this case implement radiation of a high frequency signal and a signal of a Sub-6GHz band.
It is also to be noted that the number of the changeover switch 5, the second capacitive device 6 and the inductive device 7 and the number of channel statuses will not be limited in the embodiments of the present disclosure. That is, since the Sub-6GHz band includes a plurality of bands such as n77, n78 and n79, in some embodiments, a plurality of changeover switches 5, a plurality of second capacitive devices 6 or a plurality of inductive devices 7 may be provided, so as to implement radiation of signals of the different bands n77, n78 and n79. For example, when a signal of the band n77 is radiated, the capacitance value of the second capacitive device 6 is 2.7 pf, and the inductance value of the inductive device 7 is 8 n.
In the embodiments of the present disclosure, an antenna is provided, which is applied to a mobile terminal. The antenna is mainly implemented by a first metal frame and a second metal frame of the mobile terminal, a breaking joint being provided between the first metal frame and the second metal frame. A specified position of an end, close to the breaking joint, of the first metal frame includes a feeding point, the feeding point is coupled to a first capacitive device, the first capacitive device is coupled to a changeover switch, the changeover switch is coupled to a second capacitive device or an inductive device, the second capacitive device or the inductive device is coupled to a first ground point, and the first metal frame is coupled to a second ground point, so as to form a portion of the antenna. In addition, the second metal frame is coupled to a third ground point, so as to form another portion of the antenna. Since the length of the first metal frame is within the range of a quarter wavelength of a specified band, when the changeover switch is switched between the second capacitive device and the inductive device, the two portions of the antenna not only may implement radiation of the existing band signal, but also may implement radiation of a signal of a low frequency millimeter wave band by using a harmonic wave under a high-order mode of the first metal frame, that is, may also radiate a signal of a Sub 6GHz band. In the embodiments of the present disclosure, the antenna implements radiation of various different band signals without the addition of other devices and antenna branches.
After considering the specification and implementing the disclosure disclosed here, other implementation solutions of the present disclosure would readily be conceivable to a person skilled in the art. The present application is intended to cover any variations, purposes or adaptive changes of the present disclosure, and these variations, purposes or adaptive changes follow the general principle of the present disclosure and include common knowledge or customary technical means, not disclosed by the present disclosure, in the technical field. The specification and the embodiments are only regarded as being exemplary.
It will be appreciated that the present disclosure is not limited to a precise structure having been described above and shown in the drawings, and various modifications and changes may be made without departing from the scope thereof.

INDUSTRIAL APPLICABILITY

The technical solutions provided by the embodiments of the present disclosure may include the following beneficial effects.
The embodiments of the present disclosure provide an antenna, applied to a mobile terminal. The antenna is mainly implemented by a first metal frame and a second metal frame of the mobile terminal, a breaking joint being provided between the first metal frame and the second metal frame. A specified position of an end, close to the breaking joint, of the first metal frame includes a feeding point, the feeding point is coupled to a first capacitive device, the first capacitive device is coupled to a changeover switch, the changeover switch is coupled to a second capacitive device or an inductive device, the second capacitive device or the inductive device is coupled to a first ground point, and the first metal frame is coupled to a second ground point, so as to form a portion of the antenna. In addition, the second metal frame is coupled to a third ground point, so as to form another portion of the antenna. Since the length of the first metal frame is within the range of a quarter wavelength of a specified band, when the changeover switch is switched between the second capacitive device and the inductive device, the two portions of the antenna not only may implement radiation of the existing band signal, but also may implement radiation of a signal of a low frequency millimeter wave band by using a harmonic wave under a high-order mode of the first metal frame, that is, may also radiate a signal of a Sub 6GHz band. In the embodiments of the present disclosure, the antenna implements radiation of various different band signals without the addition of other devices and antenna branches.

Claims

An antenna, applied to a mobile terminal, the mobile terminal comprising a first metal frame (1) and a second metal frame (2), a breaking joint being provided between a first end of the first metal frame (1) and a first end of the second metal frame (2), a length of the first metal frame (1) being within a range of a quarter wavelength of a specified band, and the length of the first metal frame (1) being greater than a length of the second metal frame (2),
characterized in that, the antenna comprises a first sub-antenna and a second sub-antenna,
wherein the first metal frame (1) comprises a feeding point (3) which is located at a specified position of the first end of the first metal frame (1), the feeding point (3) is coupled to a first end of a first capacitive device (4), a second end of the first capacitive device (4) is coupled to a first end of a changeover switch (5), a second end of the changeover switch (5) is coupled to a first end of a second capacitive device (6) or a first end of an inductive device (7), a second end of the second capacitive device (6) or a second end of the inductive device (7) is coupled to a first ground point, and a second end of the first metal frame (1) is coupled to a second ground point, so as to form the first sub-antenna; and
a second end of the second metal frame (2) is coupled to a third ground point, so as to form the second sub-antenna.
The antenna of claim 1, wherein the changeover switch (5) is located at a center point of the first metal frame (1).
The antenna of claim 1, wherein
responsive to switching the changeover switch (5) to be coupled to the second capacitive device (6), the first sub-antenna and the second sub-antenna are configured to radiate a low-and-medium frequency signal and a signal of a low frequency millimeter wave band; and
responsive to switching the changeover switch (5) to be coupled to the inductive device (7), the first sub-antenna and the second sub-antenna are configured to radiate a high frequency signal and the signal of the low frequency millimeter wave band.
The antenna of claim 3, wherein
responsive to switching the changeover switch (5) to be coupled to the second capacitive device (6), a portion between a position where the second capacitive device (6) is located in the first sub-antenna and the breaking joint and the second sub-antenna are jointly configured to radiate a medium frequency signal, a resonance under a quarter wavelength mode of the first sub-antenna is configured to radiate a low frequency signal, and a resonance under a three-quarter wavelength mode of the first sub-antenna is configured to radiate the signal of the low frequency millimeter wave band; and
responsive to switching the changeover switch (5) to be coupled to the inductive device (7), a portion between a position where the inductive device (7) is located in the first sub-antenna and the breaking joint and the second sub-antenna are jointly configured to radiate a high frequency signal, a resonance under a three-quarter wavelength mode of the first sub-antenna is configured to radiate the signal of the low frequency millimeter wave band.
The antenna of any one of claims 1 to 4, wherein a difference between the length of the first metal frame (1) and 30 mm is within a preset range, and the length of the second metal frame (2) ranges from 16 mm to 20 mm.
The antenna of any one of claims 1 to 4, wherein the first capacitive device (4) has a capacitance ranging from 0.5 pf to 2.5 pf.
The antenna of any one of claims 1 to 4, wherein both the first metal frame (1) and the second metal frame (2) are a bottom frame of the mobile terminal.
The antenna of any one of claims 1 to 4, wherein the breaking joint between the first end of the first metal frame (1) and the first end of the second metal frame (2) has a width of 2 mm.
The antenna of any one of claims 1 to 4, wherein the second end of the first capacitive device (4) is coupled to the first end of the changeover switch (5) through the first metal frame (1).
A mobile terminal, comprising the antenna of any one of claims 1 to 9.